Influence of fish oil supplementation on in vivo and in vitro oxidation resistance of low-density lipoprotein in type 2 diabetes

H. Pedersen, M. Petersen, A. Major-Pedersen, T. Jensen, Nina Skall Nielsen, S.T. Lauridsen, P. Marckmann

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Objective: Fish oil supplement has been proposed as a non-pharmacological strategy to correct the atherogenic lipid profile associated with type 2 diabetes mellitus. However, fish oil may have deleterious effects on lipid peroxidation and glycemic control.Design: In this study, 44 type 2 diabetic patients were randomized to vitamin E standardized (53.6 mg/day) supplementation (capsules) with 4 g daily of either fish oil (n = 23) or corn oil (n = 21) for 8 weeks preceded by a 4 week run-in period of corn oil supplementation. LDL was isolated by density gradient ultracentrifugation and oxidized in vitro with Cue(2+). As a marker of in vivo oxidation malondialdehyde concentration in LDL (LDL-MDA) was measured.Results: Fish oil reduced both mean lag time (before, 57.8; after, 48.8 min, P <0.001) and mean propagation rate (before, 0.018 &udelta;OD/min; after, 0.015 &udelta;OD/min, P <0.001), whereas corn oil had no influence on lag time and propagation rate. The changes in lag time and propagation rate differed significantly between fish oil and corn oil treatment. LDL-MDA changes differed borderline significantly between groups (FO, 110.4 pmol/mg protein; CO, 6.7 pmol/mg protein; P = 0.057). Fish oil supplementation had no influence on glycemic control as assessed from HbA(1c) and fasting blood glucose.Conclusion: According to our findings, fish oil supplementation leads to increased in vivo oxidation and increased in vitro oxidation susceptibility of LDL particles. More studies are needed to clarify the clinical importance of this finding. Sponsorship: Financially supported by The Danish Heart Association and Dansk Droge A/S. Dansk Droge A/S generously provided the fish oil and corn oil capsules.
    Original languageEnglish
    JournalEuropean Journal of Clinical Nutrition
    Volume57
    Issue number5
    Pages (from-to)713-720
    ISSN0954-3007
    Publication statusPublished - 2003

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